function required(name: string): string {
  const v = process.env[name];
  if (!v) throw new Error(`Environment variable ${name} is missing`);
  return v;
}

export const config = {
  databaseUrl: required('DATABASE_URL'),
  port: Number(process.env.PORT ?? 8090),
  host: process.env.HOST ?? '0.0.0.0',
  /** Root of the NAS mount, e.g. /mnt/bizmatch-nas */
  nasRoot: process.env.NAS_ROOT ?? '/mnt/bizmatch-nas',
  /** Directory names directly below NAS_ROOT, one per business status */
  nasDirActive: process.env.NAS_DIR_ACTIVE ?? 'AAA = ACTIVE',
  nasDirSold: process.env.NAS_DIR_SOLD ?? 'AAA = SOLD',
  nasDirInactive: process.env.NAS_DIR_INACTIVE ?? 'AAA = INACTIVE',
} as const;